Introduction
The Motorola MTP3550 was released as an upgrade from the MTP3250, redefining professional communication. With enhanced durability, extended battery life, and advanced features like integrated Bluetooth and heightened security, it sets a new standard for reliability and functionality in mission-critical scenarios.
Motorola TETRA radios are available with various firmware versions, each featuring one of the following standard AIE TETRA Encryption Algorithms (TEAs):
– CLEAR NonE2 (No Encryption) This is the only one for HamRadio use!
– TEA1 is for commercial use and is primarily used by critical infrastructure around the world. But it’s also used by some police and military agencies outside of Europe.
– TEA2 (restricted to use by Schengen / EU countries). Possession of TEA2 radios is in many countries
prohibited by law!
– TEA3 Essentially the export version of TEA2 which is for use outside of Europe by the same kinds of entities that use radios with TEA2.
– TEA4 For commercial use but is hardly used.
In 2022 ETSI introduced additional algorithms, TEA 5, TEA 6 and TEA7, in order to future-proof the technology against quantum attacks. The entire set of these original and additional algorithms will be made available in the public domain as well as TAA1 (the original authentication and key management specification) and TAA2 (the new authentication and key management specification).
Each TEA version builds upon the previous one, incorporating enhancements to meet evolving user needs and address emerging challenges in communication security and efficiency.
Frequency Range from Factory:
The Motorola Motorola MTP3550 series includes several models, also serveral HW revisions, each designed to operate within specific frequency ranges. Here are some common models and their corresponding frequency ranges, including the FuG model:
Model Number – H60PCN6TZ6AN: Frequency Range 380-430 MHz
Model Number – H60PCN6TZ5AN: Frequency Range 407-473 MHz Ham band covered no need expanding
Model Number – H60UCH6TZ7AN: Frequency Range 806-870 MHz
Model Number – H60PCN6TZ6FU FuG (Fall-back Unit Gateway): Frequency Range 406.1-470 MHz Ham band covered no need expanding
Expanded Frequency Range:
Model Number – H60PCN6TZ6AN Frequency Range: 380-440 MHz
Model Number – H60PCN6TZ5AN Frequency Range: 407-473 MHz Ham band covered no need expanding
Model Number – H60UCH6TZ7AN Frequency Range: 806-870 MHz N/A
Model Number – H60PCN6TZ6FU FuG(Fall-back Unit Gateway) Frequency Range: 406.1-470 MHz Ham band covered no need expanding
Adaptation for Ham Radio Use
The Motorola MTP3xxx series was initially designed for the German railroad and is the only TETRA radio featuring two separate knobs: one for the volume and the other for channel change. This unique design has made it a popular choice among the HamTetra radio community. Originally crafted for public safety and emergency services, its adaptability for ham radio use has been widely recognized.
With straightforward programming to accommodate amateur radio bands, enthusiasts can seamlessly integrate the MTP3550 into their setups.
Attention! Due to the nature of the radio market, some units may originate from governmental working environments, still in use, stolen, lost, or intended for destruction but salvaged by individuals. If you notice any signs such as radio logos, initial messages, back labels, or additional markings indicating that the radio might be a “tea 2” or not a “clean radio,” do not purchase it. Instead, return the radio to the seller or report it to the nearest police station.
Only Clear radio firmware can be used for HamTetra use!!
Programming
To program the Motorola MTP3550, you will need a compatible programming cable and Motorola Tetra CPS or Motorola Tetra CPS Depot software. Additionally, for firmware upgrades, depend of existing radio firmware you need the right RPK. Motorola MTP3550 firmware can be upgraded through Motorola Tetra CPS or Motorola Tetra CPS Depot software.
Please refer to the Radio Quick Start Guide
Programming Cable
Programming the Motorola MTP3550 is a straightforward process thanks to the availability of dedicated programming cable.This cable facilitate seamless communication between the radio and programming software, allowing users to customize settings, configure channels, and update firmware with ease.
Programming Cable for use:
Motorola PMKN4129A – programming USB cable for Motorola MTP3100 MTP3250 MTP3500 MTP3550 MTP6550 MTP6750 Tetra radios.
Motorola PMKN4122A – Serial programming cable MTP3150 MTP3250 MTP6450 MTP6650 MTP6750
Motorola NNTN8234A – Dual-Unit Charger for MMTP3100 MTP3250 MTP3500 MTP3550 MTP6550 MTP675 – It also allows radio programming via a mini USB port.
Following the radio pinout, it’s also possible to build a homemade cable.
Antenna Considerations
Motorola MTP3550 uses combination GPS/Radio Antenna so when replacing the antenna, it’s important to take into account this factor.
Pinout
Accessories
Motorola NNTN8234A Dual-Unit Charger for MMTP3100 MTP3250 MTP3500 MTP3550 MTP6550 MTP675 – It also allows radio programming via a mini USB port.
Operating Procedures
Please refer to the user manual Here
Interfacing with Ham Radio Networks
Motorola MTP3550 integrates seamlessly into various HamTetra environments, demonstrating reliability in Direct Mode Operation (DMO), Trunked Mode Operation (TMO) and DMO Repeater Mode, ( It works as a DMO repeater also ).
Compatibility with Other Radio Manufacturers
The Motorola MTP3550 is designed to seamlessly interface with radios from other manufacturers, ensuring interoperability and compatibility across diverse communication systems.
Maintenance and Troubleshooting
Regular maintenance, including battery checks, firmware updates, and cleaning, ensures optimal performance and longevity of the MTP3550. In the event of issues or malfunctions, troubleshooting procedures provided by Motorola or the HamRadio community can assist in diagnosing and resolving problems effectively.
Thanks to Erik OH2LAK for designing the pinout diagram.
* We do not provide programming software, licenses, additional information, or technical support beyond what is available through above published information!